| 摘要 |
PURPOSE:To enable confortable awakening without causing any feeling of startling or physical disorder by starting the sounding operation of an alarm tone at the end of inhalation. CONSTITUTION:A breathing detector 16 outputs a breathing signal responding to physical changes in a body with breathing and a inhalation end detection circuit 24 detects the end timing of the inhalation from the breathing signal of the detector 16. Then, an alarm control circuit 44 invalidates the alarm start signal to the outputting of the first signal from the detection circuit 24 after an alarm starting signal is generated at the output B of an alarm mechanism 14. Now when a switch 52 is closed at the time t1, alarming is enabled and when the set time is reached at the time t2, an alarm start signal is produced at the output B and the output C moves to ''H'' to release the resetting of an FF50. But since the output G is ''L'', the output I of the FF50 is also ''L'' and the alarming will not be done. Moreover, when the alarm start signal is generated at the time t3 and the first detection signal is produced at the output G, the output I of the FF50 moves to ''H'' and an alarm tone is given from a circuit 54. |
